I thoroughly enjoy this mod and all it offers, but the High Explosive Shotgun Shells are horrendously OP. The damage scaling gets extremely high even before infinite research, and most importantly, the knockback effect means that the moment you get HE shells and a decent number of shotgun turrets, you never have to worry about defense again. You don't even need walls! The shotgun turrets have enough range(especially with the Hero Turrets mod installed) and fire quickly enough to keep any and all biters from ever damaging any defenses about 90% of the time, which means as long as you have automatic repair methods set up, a single line of shotgun turrets is all you ever need against just about any force of biters, even if the Swarmageddon mod is on. I'd say reduce or remove the knockback effect and lower the damage bonus shotgun turrets have, and then it would be more on par with the rest of the mod.